package com.ruoyi.web.controller.common;

import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.SecurityUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUploadUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.framework.config.ServerConfig;
import com.ruoyi.teaching.service.SysUserFileService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.InputStreamResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.mail.internet.MimeUtility;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Base64;
import java.util.List;

/**
 * 通用请求处理
 *
 * @author ruoyi
 */
@RestController
@RequestMapping("/common")
@Api(tags = "ruoyi-文件")
public class CommonController {
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    private static final String FILE_DELIMETER = ",";

    @Autowired
    private SysUserFileService sysUserFileService;

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     * @param delete   是否删除
     */
    @ApiOperation(value = " 通用下载请求", notes = "通用下载请求")
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request) {
        try {
            if (!FileUtils.checkAllowDownload(fileName)) {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = RuoYiConfig.getDownloadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete) {
                FileUtils.deleteFile(filePath);
            }
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求（单个）
     */
    @ApiOperation(value = " 通用上传请求（单个）", notes = "通用上传请求（单个）")
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception {
        try {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileName = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + fileName;
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", FileUtils.getName(fileName));
            ajax.put("originalFilename", file.getOriginalFilename());
            return ajax;
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用上传请求（多个）
     */
    @ApiOperation(value = " 通用上传请求（多个）", notes = "通用上传请求（多个）")
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files, String uploadName) throws Exception {
        try {
            String filePath;
            if (!StringUtils.isEmpty(uploadName) && uploadName.equals("Cloud")) {
                String userName = SecurityUtils.getLoginUser().getUser().getUserName();
                Long userId = SecurityUtils.getUserId();
                Double sizeAll = sysUserFileService.selectUserSize(userId);
                // 计算所有要上传文件的总大小
                double totalFileSize = 0.0;
                for (MultipartFile file : files) {
                    totalFileSize += file.getSize(); // MultipartFile#getSize() 返回的是 long 类型的字节数 原来file.getSize()*0.000000953674316406
                }

                // 将已上传文件的总大小与新上传文件的总大小相加
                BigDecimal allSizeB = new BigDecimal(sizeAll.toString()).add(new BigDecimal(totalFileSize));

                // 检查总大小是否超过2GB
                if (allSizeB.compareTo(new BigDecimal(2147483648L)) > 0) {
                    return AjaxResult.error("无内存添加");
                }
                // 上传文件路径
                filePath = RuoYiConfig.getUploadPath() + "/" + uploadName + "/" + userName;
            } else {
                // 上传文件路径
                filePath = RuoYiConfig.getUploadPath();
            }
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files) {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return ajax;
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @ApiOperation(value = "本地资源通用下载", notes = "本地资源通用下载")
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        try {
            if (!FileUtils.checkAllowDownload(resource)) {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = RuoYiConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }

    @GetMapping("/{filename}")
    @ApiOperation(value = "下载Tomcat里的文件", notes = "强制下载Tomcat里的文件")
    public ResponseEntity<InputStreamResource> downloadFile(@PathVariable String filename, HttpServletRequest request) {
        try {
            // 文件路径编码，防止URL乱码
            String encodedFilename = URLEncoder.encode(filename, StandardCharsets.UTF_8.toString()).replace("+", "%20");
            String fileUrl = "http://129.204.197.40:8080/" + encodedFilename;

            // 连接到目标文件URL
            URL url = new URL(fileUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");

            // 读取文件流
            InputStream inputStream = connection.getInputStream();
            InputStreamResource resource = new InputStreamResource(inputStream);

            // 设置响应头
            HttpHeaders headers = new HttpHeaders();
            String disposition;

            // 兼容IE浏览器
            String userAgent = request.getHeader("User-Agent");
            if (userAgent.contains("MSIE") || userAgent.contains("Trident")) {
                disposition = "attachment; filename=\"" + URLEncoder.encode(filename, "UTF-8").replace("+", "%20") + "\"";
            } else {
                try {
                    // 使用MimeUtility对文件名进行编码，以处理特殊字符
                    String safeFilename = MimeUtility.encodeText(filename, "UTF-8", "B");
                    disposition = "attachment; filename=\"" + safeFilename + "\"";
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                    disposition = "attachment; filename=\"" + filename + "\"";
                }
            }

            headers.add(HttpHeaders.CONTENT_DISPOSITION, disposition);
            headers.add(HttpHeaders.CONTENT_TYPE, "application/octet-stream");
            headers.add(HttpHeaders.CONTENT_LENGTH, String.valueOf(connection.getContentLength()));

            return new ResponseEntity<>(resource, headers, HttpStatus.OK);

        } catch (Exception e) {
            e.printStackTrace();
            return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
        }
    }
}
